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/* Copyright (c) 2000, 2010 Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA */
/*
things to define before including the file:
#define LS_LIST_ITEM ListItem
#define LS_COMPARE_FUNC_DECL compare_func var_name,
#define LS_COMPARE_FUNC_CALL(list_el1, list_el2) (*var_name)(list_el1, list_el2)
#define LS_NEXT(A) (A)->next
#define LS_SET_NEXT(A,val) (A)->next= val
#define LS_P_NEXT(A) &(A)->next
#define LS_NAME plistsort
#define LS_SCOPE static
#define LS_STRUCT_NAME ls_struct_name
*/
typedef struct LS_STRUCT_NAME
{
LS_LIST_ITEM *list1;
int list_len;
int return_point;
} LS_STRUCT_NAME;
LS_SCOPE LS_LIST_ITEM* LS_NAME(LS_COMPARE_FUNC_DECL LS_LIST_ITEM *list, int list_len)
{
LS_LIST_ITEM *list_end;
LS_LIST_ITEM *sorted_list;
struct LS_STRUCT_NAME stack[63], *sp= stack;
if (list_len < 2)
return list;
sp->list_len= list_len;
sp->return_point= 2;
recursion_point:
if (sp->list_len < 4)
{
LS_LIST_ITEM *e1, *e2;
sorted_list= list;
e1= LS_NEXT(sorted_list);
list_end= LS_NEXT(e1);
if (LS_COMPARE_FUNC_CALL(sorted_list, e1))
{
sorted_list= e1;
e1= list;
}
if (sp->list_len == 2)
{
LS_SET_NEXT(sorted_list, e1);
LS_SET_NEXT(e1, NULL);
goto exit_point;
}
e2= list_end;
list_end= LS_NEXT(e2);
if (LS_COMPARE_FUNC_CALL(e1, e2))
{
{
LS_LIST_ITEM *tmp_e= e1;
e1= e2;
e2= tmp_e;
}
if (LS_COMPARE_FUNC_CALL(sorted_list, e1))
{
LS_LIST_ITEM *tmp_e= sorted_list;
sorted_list= e1;
e1= tmp_e;
}
}
LS_SET_NEXT(sorted_list, e1);
LS_SET_NEXT(e1, e2);
LS_SET_NEXT(e2, NULL);
goto exit_point;
}
{
struct LS_STRUCT_NAME *sp0= sp++;
sp->list_len= sp0->list_len >> 1;
sp0->list_len-= sp->list_len;
sp->return_point= 0;
}
goto recursion_point;
return_point0:
sp->list1= sorted_list;
{
struct LS_STRUCT_NAME *sp0= sp++;
list= list_end;
sp->list_len= sp0->list_len;
sp->return_point= 1;
}
goto recursion_point;
return_point1:
{
LS_LIST_ITEM **hook= &sorted_list;
LS_LIST_ITEM *list1= sp->list1;
LS_LIST_ITEM *list2= sorted_list;
if (LS_COMPARE_FUNC_CALL(list1, list2))
{
LS_LIST_ITEM *tmp_e= list2;
list2= list1;
list1= tmp_e;
}
for (;;)
{
*hook= list1;
do
{
if (!(list1= *(hook= LS_P_NEXT(list1))))
{
*hook= list2;
goto exit_point;
}
} while (LS_COMPARE_FUNC_CALL(list2, list1));
*hook= list2;
do
{
if (!(list2= *(hook= LS_P_NEXT(list2))))
{
*hook= list1;
goto exit_point;
}
} while (LS_COMPARE_FUNC_CALL(list1, list2));
}
}
exit_point:
switch ((sp--)->return_point)
{
case 0: goto return_point0;
case 1: goto return_point1;
default:;
}
return sorted_list;
}
#undef LS_LIST_ITEM
#undef LS_NEXT
#undef LS_SET_NEXT
#undef LS_P_NEXT
#undef LS_NAME
#undef LS_STRUCT_NAME
#undef LS_SCOPE
#undef LS_COMPARE_FUNC_DECL
#undef LS_COMPARE_FUNC_CALL
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